A donkey head connecting pin

Abstract

The invention provides a horsehead connecting pin. The horsehead connecting pin comprises a pin body, a transmission rod and a locking piece, a penetrating and inserting hole is formed in the pin body in the axial direction, a lock cylinder chamber which crosses and is communicated with the penetrating and inserting hole is formed in the pin body in the radial direction, the transmission rod is arranged in the penetrating and inserting hole and can move in the axial direction of the pin body, and the locking piece is arranged in the lock cylinder chamber and can move in the axial direction and radial direction of the pin body. The transmission rod abuts against the locking piece, one side of the locking piece abuts against the end face of the sealed end of the lock cylinder chamber, and the end face is inclined from top to bottom in the direction close to the axis of the transmission rod. When the horsehead connecting pin is inserted into a pin hole, the transmission rod pushes the locking piece to the outer portion of the pin body from the lock cylinder chamber, the locking piece abuts against the inner wall of the pin hole, a clearance between the horsehead connecting pin and the pin hole can be effectively filled, vibration friction cannot be generated between the horsehead connecting pin and the pin hole, abrasion borne by the outer side of the horsehead connecting pin and the inner wall of the pin hole is reduced, it is guaranteed that the horsehead connecting pin can be firmly inserted into the pin hole, noise in the production process is reduced, and the situation that the connecting position of a horsehead and an oil beam cracks is avoided.

Description

technical field [0001] The invention relates to a donkey head fixing device, in particular to a donkey head connecting pin. Background technique [0002] The function of the donkey head connecting pin is to connect the oil beam and the donkey head of the pumping unit, so that the donkey head hangs on the oil beam and moves with the oil beam. Wherein when carrying out wellhead repair operation, usually need the donkey head connecting pin of donkey head side to be dismantled to make donkey head overturn, thereby avoid the normal carrying out of donkey head influence wellhead repair operation. Therefore, in order to ensure that the donkey head connecting pin can be removed smoothly when needed, there will be more or less gaps between the donkey head connecting pin and the pin hole when inserted into the pin hole. When the pumping unit is working normally, due to the vibration of the pumping unit itself and the conversion between the oil beam and the donkey head, vibration will...

AI Technical Summary

Problems solved by technology

When the pumping unit is working normally, due to the vibration of the pumping unit itself and the conversion between the oil beam and the donkey head, vibration will be generated between the oil beam and the donkey head, and vibration will be generated between the donkey head connecting pin and the pin hole Friction makes the outer side of the donkey head connecting pin and the inner wall of the pin hole easy to be worn, and the connection between the donkey head connecting pin and the pin hole is easy to loosen, which will eventually cause the donkey head to shake up and down and generate a lot of noise. In severe cases, the donkey head will appear Problems such as cracking at the connection with the oil beam not only affect the oil production rate of the oil well, but also bring great difficulties to the safe and environmentally friendly production of the oil field

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